Light, photometry and illumination : a thoroughly rev. ed. of ''Electrical illuminating engineering'' (1912)
Barrows, William Edward, 1878-1960 · New York ; London : McGraw-Hill Book Co. · leaf 127
ardsand seventeen lamps compared with them is shown in Fig. 53,The number of the lamps, their voltages and their candle-power,as read from the scale are written along the margin, each lampbeing recorded opposite its corresponding group of record dots. April Ijtn yy nc Date Test No. Photometer - ft… … Mean Value of Standards = 16.00 C.P. Fig. 53.—A complete record sheet. The proper position of the candle-power scale S& f-om whichthe candle-power values were read was determined in the follow-ing manner: The preliminary relative candle-power readingsof the six standards, whose mean value was…
Light · Photometry · Electric lighting
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